Why is there no explanation of this directive on the sqlite website (search returns nothing)? Had Keith not spoon fed me it a while back I'd never have been able to use extensions as I've never managed to load one any other way apart from the way he taught me (shown below).

DSQLITE=core_init

// add below to bottom of sqlite3.c 
#include "eval.c"
#include "carray.c"
#include "btreeinfo.c"
#include "series.c"

int core_init(const char* dummy)
{
	int nErr = 0;
	nErr += sqlite3_auto_extension((void(*)())sqlite3_eval_init);
#ifndef SQLITE_OMIT_VIRTUALTABLE
	nErr += sqlite3_auto_extension((void(*)())sqlite3_carray_init);
	nErr += sqlite3_auto_extension((void(*)())sqlite3_btreeinfo_init);
	nErr += sqlite3_auto_extension((void(*)())sqlite3_series_init);
#endif
	return nErr ? SQLITE_ERROR : SQLITE_OK;
}